update install files

* correct bad paths in install.sh (thanks @pidgypost)
* update brew install script
* update nvm installation to work correctly

fixes #6 and fixes #7

install/link.sh

@@ -3,7 +3,7 @@
 DOTFILES=$HOME/.dotfiles
 
 echo "creating symlinks"
-linkables=$( ls -1 -d **/*.symlink )
+linkables=$( find -H "$DOTFILES" -maxdepth 3 -name '*.symlink' )
 for file in $linkables ; do
     target="$HOME/.$( basename $file ".symlink" )"
     echo "creating symlink for $file"